Fastening device



FIG. 1 is a first perspective view of a fastening device;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a side view thereof, the opposite side being a mirror image.

CLAIM The ornamental design for a fastening device, as shown anddescribed.